<body>
<div id="tree" data-leaves="47" data-plant-height="2.4m"></div>
<script>
var tree = document.getElementById("tree");
//getAttribute()取值屬性
console.log(tree.getAttribute("data-leaves"));
console.log(tree.getAttribute("data-plant-height"));
//setAttribute()賦值屬性
tree.setAttribute("data-leaves","48");
//data-前綴屬性可以在JS中通過dataset取值，更加方便
console.log(tree.dataset.leaves);
console.log(tree.dataset.plantHeight);
//賦值
tree.dataset.plantHeight = "3m";
tree.dataset.leaves--;
//新增data屬性
tree.dataset.age = "100";
//刪除，設置成null，或者delete
tree.dataset.leaves = null;
delete tree.dataset.age;
//jQuery的data方法
var $tree = $('#tree');
console.log($tree.data("plant-height"));
</script>
</body>
JS獲取自定義屬性data值
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